| 摘要 |
A treadleplate for use in an automatic carwash system for regulating the length of time a cleaning solution is sprayed on the tires of a passing vehicle in direct relationship to the size of the vehicle tire. A horizontal base plate is mounted on the carwash floor in the path of one of the vehicle tires. A contact plate is pivotally mounted on the base plate and is movable from a normal inclined, at-rest position to a horizontal depressed position when rolled over by the vehicle tire. The contact plate is formed with a stepped outer swinging edge which provides a series of transversely spaced contact zones of varying tire contact length. These zones are adapted to be selectively engaged by one of the tires of a vehicle moving through the carwash which depresses the contact plate and actuates a cleaning solution control valve. The particular zone which is engaged by the tire is in direct relationship to the transverse spacing or track of the particular vehicle moving through the carwash. The cleaning solution control valve is open for the exact amount of time required to properly clean the particular size tire of the passing vehicle. This valve actuation time is in direct relationship to the amount of time required for the vehicle tire to pass over the selected contact zone, which in turn in is a direct relationship to the vehicle track and tire size.
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